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to bring in pete williams, who's also standing by for us in washington, d.c. and pete, i understand that there was an initial positive test, but there's really no way to know whether it's really ricin until additional testing is done. >> ever since the anthrax mailings, no mail has gone directly to the white house, capitol hill and many other government offices. it's all sent to off site facilities to test it for various things. both facilities gave an initial positive for a poison called ricin. there were subsequent tests, they were conflicting. but you can't really know for sure what it is until it's sent to a lab and cultured and then you look under a mike scope to see what it is. now, we have seen events in the past, craig, ice ricin is made tr castor beans and someone will just take dried beans and grind them up and put them in a letter. now, that will test positive for ricin even though there's no ricin there. i guess it would be like the difference between poppies and opium. they're related, but it's not the same thing. so you won't know whether it's ricin until later today i
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